Improving cracked petroleum distillates



Patented Apr. 25, 1933 ROBERT E. BURK, 0F CLEVELAND, OHIO, ASSIGNOR TOTHE STANDARD OIL COMPANY, OF CLEVELAND, OHIO, A. CORPORATION OF OHIOIMPROVING CRACKED PETROLEUM DISTILLATES No Drawing Application filedAugust 9,

Petroleum which has been subjected to pyrogenetic decomposition, as forinstance in the processes of cracking gas oil and the like, exhibits atendency to develop more or less gum formation, such gum becoming,manifest on evaporation, and occasionally tending to give trouble incarburetor-fed engines using such distillates for fuel. This gumformation tendency in certain instances is found to be accentuated onstorage. The prevention or inhibition of gum tendency is accordinglyhighly desirable; and it is among the objects of the present inventionto provide products satisfactory in this respect.

To the accomplishment of the foregoing and related ends, the invention,then consists of the features hereinafter fully described, andparticularly pointed out in the claims, the following descriptionsetting forth in detail certain embodiments of the invention, thesebeing illustrative however of but a few of the various ways in which theprinciple of the invention may be employed.

In proceeding in accordance with my in vention, the cracked petroleumdistillate such as is prone to develop gum formation is subjected to theaction of an organic compound inhibitive of such tendency and result. Assuch treating agent, there is employed an organic compound containing assemicarbazide or derivative thereof in which substituent radicals are inthe 4 position, for example 4, 4 diphenyl semicarbazide, or as hydrazinein which one or more hydrogen atoms is replaced by an alkyl radical oran aryl radical except mononaphthyl, for example unsymmetrical, diphenylhydrazine, iso-amyl phenyl hydrazine, meta, nitro-benzhydrazine, 2, 4di-nitro phenyl hydrazine, or mixtures of such.

The amount of such agent required is small, for instance 0.0004 to 0.5per cent. In general therefore, it is not necessary to exceed one-halfof one per cent., or at the outside one per cent., and amountstherebeyond are wasted. A desirable manner of incorporating the material.into petroleum distillate may involve first dissolving the 1929. SerialNo. 384,798.

agent in a suitable solvent, for instance conveniently ether, benzol, orthe like, and such solution may then be mixed with the petroleum. Thepetroleum distillate may have been previously subjected to a customarylye wash if desired, and in fact a slight alkaline or at least neutralreaction is advantageous. The mixing may be effected in any convenientmanner, adding the agent to the petroleum in the container and suitablyagitating to 'a ood dissemination, or proportionally feeding the sameinto a flowing stream of the petroleum in calibrated amount.

As an illustrative example: 20 pounds of 4, 4 di-phenyl semicarbazide isdissolved in benzol to make up substantially ten gallons volume, andthis is in turn mixed with twenty-five hundred barrels of the crackedgasoline.

As another example: 20 pounds of unsymmetrical diphenyl hydrazine isdissolved in benzol to make up substantially ten gallons volume, andthis is mixed into twenty-five hundred barrels of the cracked gasoline.

Similarly, as indicated, any of the various agents contemplated can beincorporated, and cracked distillates be so treated, the treatmenthaving the advantage of fitting well into the usual character ofprocedure, without interfering with customary practice otherwise.

c Other modes of applying the principle of the invention may be employedinstead of the details disclosed, change being made as regards suchdetails, provided the features set forth in any of the following claims,or the equivalent of such, be employed.

I therefore particularly point out and distinctly claim as myvinvention 1. A volatile cracked petroleum distillate motor fuel treatedwith about 0.0004 to 1 per cent of a reagent selected from the groupconsisting of semicarbazide, derivatives of semiearbazide in whichsubstituent radicles are in the 4 position, and hydrazines containing anaromatic radiele except mono-- naphthyl.

2. A volatile cracked petroleum distillate motor fuel treated with about0.0004 to 1 per cent of a, reagent selected from the group consistingofsemicarbezide oriderivatives of semicarbazlde 1n WhlCh substltuentradlcles,

are in the 4 position.

3. A volatile cracked petroleum distillate motor fuel treated With about0.0004'to 1 percent of it hydrazine containing an aromatic radicleexcept mono-naphthyl.

4. A'volatile cracked petroleum distillate motor fuel treated with about00004 tel per cent of 4, 4 di-phenyl semicarbazide,

5. A volatile cracked petroleum distillate motor fuel treated withunsymmetrical diphenyl hydrazine. I

Signed by me this 'Zth day ofAugust, 1929.

ROBERT E. BURK.

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